I make a game in c++ using SFML library with 2d world made of tiles but when I display it, the last lines are wrong size as you can see:

The size of world is 100x100 tiles. I tried to check last tile width or displaying only first 10x10 tiles but the problem still exist so this is not problem with size of last tiles.
Here you can see:

Here is a class of Tile
class Square{
public:
int x, y, object_type;
sf::RectangleShape rect;
sf::Sprite object;
Square(sf::Color col, int b, int c){
rect = sf::RectangleShape(sf::Vector2f(200, 200));
rect.setFillColor(col);
rect.setOutlineColor(sf::Color(0, 0, 0, 0));
rect.setOutlineThickness(1);
object_type = 0;
x = b;
y = c;
rect.setPosition(790+15*x, 440+15*y);
}
...
}
This is code of filling the world without changing colors of the tiles(it's only cosmetic)
vector<vector<Square>> world;
for(int i=0;i<100;i++){
vector<Square> v;
for(int j=0;j<100;j++){
Square sq(sf::Color(255, 255, 255), j, i);
v.push_back(sq);
}
world.push_back(v);
}
And this is how am I displaying it
window.clear();
for(int i=0;i<world.size();i++) for(int j=0;j<world.at(i).size();j++){
window.draw(world.at(i).at(j).rect);
if(world.at(i).at(j).object_type) window.draw(world.at(i).at(j).object);
}
window.display();